数字农科院2.0

Genotype-Dependent Effects Of Phosphorus Supply O.n Physiological And Biochemical R esponses To Al-Stress In Cultivated And Tibetan Wild Barley

文献类型： 外文期刊

作者： Wang, Runfeng;Shi, Min;Zhang, Guoping;Wu, Feibo;Liu, Wenxing;Chen, Zhong-Hua;Ahmed, Imrul Mosaddek;Dai, Huaxin;Dai, Huaxin

作者机构：

关键词： Wild barley (H. vulgare ssp Spontaneum); Al stress; Phosphorus; Alleviation

期刊名称： PLANT GROWTH REGULATION

ISSN： 0167-6903

年卷期： 2017 年 82 卷 2 期

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摘要： Aluminium (Al) toxicity and phosphorus (P) deficiency often co-exist in acidic soils and limit plant growth and crop production. To investigate the alleviating effects of different levels of phosphorus on Al stress, greenhouse hydroponic experiments were conducted using two contrasting Tibetan wild barley genotypes XZ16 and XZ61 of Al tolerant and sensitive, respectively, and Al tolerant cv. Dayton. The results showed that Al stress induced reduction in P accumulation in plants; and stem and leaf P concentrations of the three genotypes, except of XZ16 under HP + Al (100 A mu M Al with high level of 360 A mu M P) which was close to the control level. XZ16 recorded significantly higher P accumulation in plants, compared with XZ61 and Dayton, and P concentrations in leaves under Al stress, and in stems under NP + Al (100 A mu M Al with normal level of 180 A mu M P) and HP + Al. Meanwhile, H+-, Ca2+Mg2+-, and Total- ATPase activities in XZ16 and Dayton under Al stress were markedly higher than in XZ61. Normal or high level of P under Al stress could relieve Al stress as enhanced plant biomass, with increased photosystem II photochemistry (Fv/Fm) and P content, relative to the low level of 90 A mu M P. Compared with XZ61, addition of high P concentration for XZ16 significantly increased the values of Gs and Tr, with higher root GPX and H+-ATPase activities, and such nutrient elements as P, Mg and Ca in stems and leaves, and induced more malate secretion, but less MDA accumulation.

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